Daily Sunspot Evaluation
Observation Sheet Thursday, 31 July 1958
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 17
- Number of spots (f)
- 244
- Relative number (R)
- 414
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 32 | 27 | 24E | ||||
| 2 | C – 29 | 16 | 23E | ||||
| 3 | A – 1 | 6 | 80E | ||||
| 4 | E – 20 | -9 | 48E | ||||
| 5 | C – 18 | -9 | 25E | ||||
| 6 | C – 3 | -24 | 48E | ||||
| 7 | A – 1 | -10 | 23W | ||||
| 8 | A – 3 | -21 | 44W | ||||
| 9 | D – 21 | -18 | 51W | ||||
| 10 | F – 27 | -15 | 73W | ||||
| 11 | D – 14 | 6 | 35W | ||||
| 12 | A – 1 | 16 | 74W | ||||
| 13 | C – 28 | 19 | 38W | ||||
| 14 | C – 14 | 12 | 80W | ||||
| 15 | A – 1 | 10 | 3W | ||||
| 16 | H – 3 | 18 | 16W | ||||
| 17 | E – 28 | 7 | 2W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.